题目描述

Calculate a + b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

输入描述:

Each input file contains one test case.  Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000.  The numbers are separated by a space.

输出描述:

For each test case, you should output the sum of a and b in one line.  The sum must be written in the standard format.

输入例子:

-1000000 9

输出例子:

-999,991